Securitized Mortgage Trusts - Change in Fair Value of Net Trust Assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Change in fair value of net trust assets, including trust REO losses
Change in fair value of net trust assets, excluding REO	$ (2,316)	$ 3,113	$ (6,412)	$ (3,043)
Gains from REO	1,452	(4,572)	3,165	(1,099)
Change in fair value of net trust assets, including trust REO gains	$ (864)	$ (1,459)	$ (3,247)	$ (4,142)